llvm.org GIT mirror llvm / release_70 test / CodeGen / AMDGPU / i1-copy-from-loop.ll
release_70

Tree @release_70 (Download .tar.gz)

i1-copy-from-loop.ll @release_70raw · history · blame

; RUN: llc -march=amdgcn -verify-machineinstrs < %s | FileCheck -check-prefix=SI %s
; RUN: llc -march=amdgcn -mcpu=tonga -verify-machineinstrs < %s | FileCheck -check-prefix=SI %s

; SI-LABEL: {{^}}i1_copy_from_loop:
;
; Cannot use an SGPR mask to copy %cc out of the loop, since the mask would
; only contain the lanes that were active during the last loop iteration.
;
; SI: ; %for.body
; SI:      v_cmp_gt_u32_e64 [[SREG:s\[[0-9]+:[0-9]+\]]], 4,
; SI:      v_cndmask_b32_e64 [[VREG:v[0-9]+]], 0, -1, [[SREG]]
; SI-NEXT: s_cbranch_vccnz [[ENDIF:BB[0-9_]+]]
; SI:      [[ENDIF]]:
; SI-NOT:  [[VREG]]
; SI:      ; %for.end
; SI:      v_cmp_ne_u32_e32 vcc, 0, [[VREG]]
define amdgpu_ps void @i1_copy_from_loop(<4 x i32> inreg %rsrc, i32 %tid) {
entry:
  br label %for.body

for.body:
  %i = phi i32 [0, %entry], [%i.inc, %end.loop]
  %cc = icmp ult i32 %i, 4
  br i1 %cc, label %mid.loop, label %for.end

mid.loop:
  %v = call float @llvm.amdgcn.buffer.load.f32(<4 x i32> %rsrc, i32 %tid, i32 %i, i1 false, i1 false)
  %cc2 = fcmp oge float %v, 0.0
  br i1 %cc2, label %end.loop, label %for.end

end.loop:
  %i.inc = add i32 %i, 1
  br label %for.body

for.end:
  br i1 %cc, label %if, label %end

if:
  call void @llvm.amdgcn.exp.f32(i32 0, i32 15, float undef, float undef, float undef, float undef, i1 true, i1 true)
  br label %end

end:
  ret void
}

declare float @llvm.amdgcn.buffer.load.f32(<4 x i32>, i32, i32, i1, i1) #0
declare void @llvm.amdgcn.exp.f32(i32, i32, float, float, float, float, i1, i1) #1

attributes #0 = { nounwind readonly }
attributes #1 = { nounwind inaccessiblememonly }